Reflowed all of them successfully(tested OK!) to starboards.
A direct drive from 4 Sanyo 18650's on a cold day(18degC) gave 500mA initial current. The cells were each at about 3.8V. The current was measured by Fluke DMM's max function after driving the LED for a brief moment (since w/o heatsink). Hence more current draw is expected at normal operating conditions.
If you want to see what underwater fluorescence looks like (which is what I was using the Nichia UV LEDs for),
and why some people say that it is like being in the movie "Avatar",
have a look at this video of mine: http://www.youtube.com/watch?v=4V9TCdCbX6U
This video was made with blue light (around 450 nm) instead of UV, however,
because the fluorescence is much stronger with blue light,
apparently because marine life has adapted to the properties of water,
which is more transparent to blue light than it is to UV.